MH89626C
TIP
RING
RF
TF
LPND
VBat
RF1
RF2
VEE
AGND
VDD
IC
VAC
IC
CS
SHK
LED
LCA
SD1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
VREF
D1
C2i
Do
F1i
IC
IC
IC
GS
IC
SD7
SD6
SD5
IC
VRLY
RGND
RD2
RD3
RD1
Preliminary Information
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
Figure 2 - Pin Connections
Pin Description
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
Name
TIP
RING
RF
TF
LGND
V
Bat
RF1
RF2
V
EE
AGND
V
DD
IC
VAC
Description
Tip Lead:
Connects to the TIP lead of the telephone line.
Ring Lead:
Connects to the Ring lead of the telephone line.
Ring Feed.
Tip Feed.
Loop Ground:
Return path for the battery (V
Bat
) supply voltage. Connects to System
Ground.
Battery Supply Voltage:
Normally -48V.
Ring Feed 1:
Ringing input.
Ring Feed 2:
Ringing output.
Negative Supply Voltage.
(-5V).
Analog Ground:
Analog and Digital Ground. Connects to system ground.
Positive Supply Voltage.
(+5V).
Internal Connection.
Battery AC Component (input).
AC noise present in the V
Bat
supply isolated from the DC
components, can be applied to this pin to reduce longitudinal noise on TIP and RING. To
implement this feature, connect a 0.1µF 100V capacitor from V
Bat
to VAC, and 1kΩ resistor
from VAC to AGND. This pin must be tied to AGND when not used.
Internal Connection.
Chip Select (Input):
A TTL compatible digital input to enable the SDi to control all the
functions of the driver.
Switch Hook Detect (Output):
A logic low indicates an off-hook condition.
LED Drive (Output).:
Drives an LED directly through an internal 2.2kΩ resistor. A logic low
indicates an off-hook condition.
Loop Current Adjust (input):
If this pin is left open, the constant current will be set at
23mA. The loop current can be adjusted by connecting a resistor to V
EE
.
14
15
16
17
18
IC
CS
SHK
LED
LCA
2-286
MITEL [ MITEL NETWORKS CORPORATION ]
